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Fig. 1 | BMC Neurology

Fig. 1

From: Venous hypertension caused by a meningioma involving the sigmoid sinus: case report

Fig. 1

a Preoperative computed tomography (CT) scan revealing no intracranial space-occupying lesions or hydrocephalus except an asymptomatic arachnoid cyst of the left middle fossa. bc Preoperative magnetic resonance images showing the lesion in the right sigmoid sinus (arrowhead) appearing as isointense on T1-weighted image (b), and with homogeneous enhancement following intravenous administration of gadolinium (c). No obvious dural tail sign is present. d Sagittal gadolinium-enhanced T1-weighted images revealing the mass lesion (arrowhead) located under the transverse sinus (arrow). Mass lesion causes severe luminal narrowing. e Conventional angiogram demonstrating the dominant right transverse sinus with hypoplastic left transverse sinus, and subtotal occlusion of the dominant right sigmoid sinus in the venous phase, with antegrade right transverse flow and poor collateral flow indicating this flow is dependent even in subtotal occlusion. f Conventional angiogram, venous phase, showing the mass lesion apparently located at the inner sinus wall mimicking venous thrombosis

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